DWR Investments in Improving Forecasts at all Time Scales
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1 DWR Investments in Improving Forecasts at all Time Scales Dr. Michael Anderson, State Climatologist WEF Water Year 2019: Feast or Famine? December 5, 2018
2 Talk Overview Drought, Flood, and Atmospheric Rivers New Observations and Forecast Opportunities Intel for Integrated Water Management in a Changing Climate
3 Key Phenomena Affecting California Water Supply/Flooding: Polar Processes Storm Track changes Cyclogensis L Flooding & water supply 3 keys: Water Vapor Storm Dynamics Terrain MJO/Tropical Convection Easterly Wave ENSO The size, number, and strength of atmospheric river events (ARs) result from the alignment of key physical processes operating on different space and time scales that will change with climate change
4 Atmospheric Rivers and Precipitation Accumulation Variability on Multiple Scales WY2015: 121 days in 5 days 18% of WY total 1 in 45 days Days 16.4 in 24 days 44% of WY total 8.4 in 14 days
5 Source: Dettinger and Cayan (2014) Decadal scale precipitation variability tied to Atmospheric River landfall variability
6 California s Advanced Observing System for Atmospheric Rivers Starting in 2008 DWR collaborated with NOAA ESRL and Scripps Institution of Oceanography to develop AR Observing System
7 ASO High Elevation Snow Observations For more information see:
8 Forecast Tools from the Center for Western Weather and Water Extremes (CW3E) AR Outlook Tool
9 AR Strength Forecast and Uncertainty Tool
10 IVT as a Prognostic Variable in Weather Forecast Models
11 Distribution of Landfalling Atmospheric Rivers on the U.S. West Coast During Water Year 2015 AR Strength AR Count Weak 22 Moderate 20 Strong 13 Extreme 1 Exceptional 1 57 Atmospheric Rivers made landfall on the USWC during the 2015 water year Ralph/CW3E AR Strength Scale Weak: IVT= kg m 1 s 1 Moderate: IVT= kg m 1 s 1 Strong: IVT= kg m 1 s 1 Extreme: IVT= kg m 1 s 1 Location of landfall represents position where AR was strongest at landfall. Many ARs move down the coast over time. This map does not show these areas. Exceptional: IVT>1250 kg m 1 s 1 By F.M. Ralph, C. Hecht, J. Kalansky
12 Distribution of Landfalling Atmospheric Rivers Over the U.S. West Coast During Water Year 2017 AR Strength AR Count Weak 21 Moderate 26 Strong 16 Extreme 5 Exceptional 0 68 Atmospheric Rivers made landfall on the USWC during the 2017 water year Ralph/CW3E AR Strength Scale Weak: IVT= kg m 1 s 1 Moderate: IVT= kg m 1 s 1 Strong: IVT= kg m 1 s 1 Extreme: IVT= kg m 1 s 1 Location of landfall represents position where AR was strongest at landfall. Many ARs move down the coast over time. This map does not show these areas. Exceptional: IVT>1250 kg m 1 s 1 By F.M. Ralph, C. Hecht, J. Kalansky
13 Magnitude Event Clustering Duration Duration Between Freezing Elevation
14
15 Summary Thoughts Over the past decade, DWR has invested significantly in observations and work with collaborative partners to improve forecasts from the event to seasonal time scales Investments in observations and forecasts go hand in hand and must be accompanied by decision support development to translate new data streams into actionable information. These investments continue at a time where potential exists to generate meaningful decision support for water resources management in the next decade
16 Questions?
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